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by ehem
Mon Jul 19, 2021 5:59 am
Forum: Advanced users
Topic: Virtualisation on Pi 4? (ESXi? Xen? KVM? video acceleration?)
Replies: 3
Views: 882

Re: Virtualisation on Pi 4? (ESXi? Xen? KVM? video acceleration?)

I read that ESXi, Xen and KVM are available on Pi 4 and I am curious how well this performs (open for alternatives). The reason is that I think about using the Pi as my daily computer (Media Playback, Browser, Email) and as a file server (probably BTRFS with Samba), but for security reasons I want ...
by ehem
Mon Jul 19, 2021 3:30 am
Forum: FreeBSD
Topic: A novel sort of FreeBSD setup
Replies: 0
Views: 1248

A novel sort of FreeBSD setup

Due to goals distinct from everyone else, I've been aiming for a different sort of setup. Since boot times are an issue for this case, my goal simply to have FreeBSD running on a Raspberry PI 4B, but to have FreeBSD running on a Raspberry PI 4B at the same time as Linux. As a result, my goal has bee...
by ehem
Wed Dec 09, 2020 6:48 am
Forum: General discussion
Topic: Latest Pi4 revision
Replies: 11
Views: 2814

Re: Latest Pi4 revision

What is different in 1.4 (4GB) and is it already available? I hope there is a text on board for its revision number. I'll need someone else to confirm, but are there any v1.2 boards which lack the dedicated VL805 SPI EEPROM? This seems a more significant difference since it means a more capable dri...
by ehem
Tue Dec 08, 2020 3:39 am
Forum: Debian
Topic: Guide: Installation of *VANILLA* Debian 11 (or later) on a Raspberry Pi 4
Replies: 120
Views: 44319

Re: Guide: Installation of *VANILLA* Debian 11 (or later) on a Raspberry Pi 4

The Tianocore build is slick . "Feels" very much like a conventional PC BIOS. Being able to use off-the-shelf software is very nice. There are still issues left to be worked out, but this is quite good. In my case the problem is Xen-ARM's ACPI support is very incomplete. Since I need graph...
by ehem
Tue Dec 08, 2020 3:12 am
Forum: Linux Kernel
Topic: RPF kernel plans
Replies: 1
Views: 2945

RPF kernel plans

What are the Raspberry PI Foundation's plans for the RPF kernel series? I had been guessing the 5.9 kernel would be in good enough shape for my project. Major issue is the driver for the VideoCore portion of the 4B. Problem is, over the past few days, the rpi-5.9.y branch of https://github.com/raspb...
by ehem
Tue Dec 08, 2020 2:55 am
Forum: Linux Kernel
Topic: Status of Raspberry Pi 4 in Mainline
Replies: 28
Views: 22051

Re: Status of Raspberry Pi 4 in Mainline

As I understand, "upstream" are wanting to discourage people from using device names to identify partitions, preferring volume labels and UUIDs instead. That is why there is no way to force a particular mmcblk index (e.g. mmcblk0) to be used on a specific MMC interface. In the downstream ...
by ehem
Tue Dec 08, 2020 2:40 am
Forum: General discussion
Topic: Installing Xen on Raspberry Pi
Replies: 29
Views: 12062

Re: Installing Xen on Raspberry Pi

Presently I've got two approaches to getting Xen running on a Raspberry PI which are acceptable to me. First approach is having the Tianocore build to load GRUB, which then loads Xen and the kernel. Second approach is having U-Boot load GRUB, which then loads Xen and the kernel. The reason I like GR...
by ehem
Tue Dec 08, 2020 2:08 am
Forum: General discussion
Topic: Installing Xen on Raspberry Pi
Replies: 29
Views: 12062

Re: Installing Xen on Raspberry Pi

Does anyone know if this is possible at the moment? First item is, what is your actual goal? Is it displaying graphics generated by a VM? Is it interacting with the graphics hardware in a VM? The latter isn't possible on a Raspberry PI and certainly won't be possible until maybe a 5B, more likely a...
by ehem
Fri May 22, 2020 11:29 pm
Forum: Off topic discussion
Topic: Python 2 EoL...at least in theory
Replies: 51
Views: 6238

Re: Python 2 EoL...at least in theory

They can almost certainly be automated. Worst case, write a Python 2 interpreter in Python 3 and you should be able to continue running Python 2 within Python 3. I haven't done anything very gnarly with Python, but 2 and 3 are mostly fairly compatible. ... No, Heater's right. Although there are som...
by ehem
Fri May 22, 2020 10:35 pm
Forum: Off topic discussion
Topic: In which language is Chromium OS written?
Replies: 5
Views: 1190

Re: In which language is Chromium OS written?

Did they used Assembly for low level code as I know that they had to change some things to make booting a lot faster? Most OSes include a little bit (10000-50000 lines per processor architecture) of assembly language for portions of booting and interfacing with processor features. Assembly language...
by ehem
Fri May 22, 2020 9:43 pm
Forum: General discussion
Topic: Raspberry Pi 4 USB mass storage beta (beta means it not ready yet, and not officially released!)
Replies: 282
Views: 132534

Re: Raspberry Pi 4 USB mass storage beta

As with Pi 3 the bootloader enumerates USB devices and when it finds a mass storage device it checks if the partition defined by the PM_RSTS register is present, FAT. It then processes config.txt and start.elf before booting or proceeding to the next device. There is deliberately nothing to control...
by ehem
Fri May 22, 2020 5:34 am
Forum: General discussion
Topic: Raspberry Pi 4 USB mass storage beta (beta means it not ready yet, and not officially released!)
Replies: 282
Views: 132534

Re: Raspberry Pi 4 USB mass storage beta

It will boot from the drive with the bootable OS on it. Not sure why you think this is a problem (it isn't). I almost always have more that one drive on my computers, including the USB booted Pi 4B2 I'm replying from now. The Pi won't try to boot from a drive that is not bootable (a data drive). Yo...
by ehem
Fri May 22, 2020 3:33 am
Forum: General discussion
Topic: Raspberry Pi 4 USB mass storage beta (beta means it not ready yet, and not officially released!)
Replies: 282
Views: 132534

Re: Raspberry Pi 4 USB mass storage beta

Will a dumb USB2 key with MBR and FAT-only end up taking precedence over a USB3 which has a GPT and all the data the RP4 needs to boot? Depends on what's bootable. USB devices are enumerated in the order they are seen by the OS. If both are bootable, then the one that is ready first will boot, and ...
by ehem
Fri May 22, 2020 2:57 am
Forum: Off topic discussion
Topic: Python 2 EoL...at least in theory
Replies: 51
Views: 6238

Re: Python 2 EoL...at least in theory

As it stands Python 2 programs do not run under Python 3. That smells like a different language. Not only the the changes are not so trivial and some are impossible find easily without looking at all your code carefully. This cannot be automated. They may be no errors from the run time. They can al...
by ehem
Fri May 22, 2020 2:37 am
Forum: General discussion
Topic: Raspberry Pi 4 USB mass storage beta (beta means it not ready yet, and not officially released!)
Replies: 282
Views: 132534

Re: Raspberry Pi 4 USB mass storage beta

Come to think of it, another issue of USB boot behavior comes to mind: What order do USB devices get probed in? This is an issue if I've got two USB storage capable devices plugged in. Will a dumb USB2 key with MBR and FAT-only end up taking precedence over a USB3 which has a GPT and all the data th...
by ehem
Fri May 22, 2020 2:18 am
Forum: General discussion
Topic: Installing Xen on Raspberry Pi
Replies: 29
Views: 12062

Re: Installing Xen on Raspberry Pi

Other gotchas: when the Dornerworks notes say it only supports 1Gb system memory, it boots on my Pi with 4 Gb, so hopefully that just means it ignores the extra 3 Gb. However, when it says it doesn't support HDMI, it's serious - it won't even boot unless you unplug your monitor. Due to reading an a...
by ehem
Thu May 21, 2020 11:33 pm
Forum: General discussion
Topic: Raspberry Pi 4 USB mass storage beta (beta means it not ready yet, and not officially released!)
Replies: 282
Views: 132534

Re: Raspberry Pi 4 USB mass storage beta

GPT is supported for USB mass storage boot only. SD card GPT will come later because that's different legacy file system code to untangle in start.elf (future rpi-update). No official support for hybrid MBR but you might get away with it so long as the VC boot partition is always first plausible EF...
by ehem
Wed Jan 15, 2020 6:25 am
Forum: Bare metal, Assembly language
Topic: Status of U-Boot Support for Pi 4
Replies: 12
Views: 4903

Re: Status of U-Boot Support for Pi 4

There are a few OSes that already use U-boot on the pi. Whenever I come across it in an OS I am converting to NOOBS or PINN, I have to strip it out and revert to the standard bootloader because it prevents multi-boot. Actually, could you list these? They may be valuable as samples for figuring out ...
by ehem
Wed Jan 15, 2020 12:36 am
Forum: Bare metal, Assembly language
Topic: Status of U-Boot Support for Pi 4
Replies: 12
Views: 4903

Re: Status of U-Boot Support for Pi 4

There are a few OSes that already use U-boot on the pi. Whenever I come across it in an OS I am converting to NOOBS or PINN, I have to strip it out and revert to the standard bootloader because it prevents multi-boot. It seems U-boot needs to exist on the first partition and all partition reference...
by ehem
Tue Jan 14, 2020 11:12 pm
Forum: General discussion
Topic: Can read from, but can't write to USB drive
Replies: 19
Views: 4092

Re: Can read from, but can't write to USB drive

Is there not a better format for the drive that will be cross-compatible with the Mac and the RPi? Yes, there is. UDF . Support varies from OS to OS, but most OSes have at least read support. Only very recent versions of the Linux UDF Tools include a `fsck` program which is worrisome for data integ...
by ehem
Tue Jan 14, 2020 2:42 am
Forum: Bare metal, Assembly language
Topic: Status of U-Boot Support for Pi 4
Replies: 12
Views: 4903

Re: Status of U-Boot Support for Pi 4

I'm guessing Raspberry Pi4Bs are officially supported by U-Boot? I'm guessing based upon how long ago this discussion was and how recently the referred repositories were updated. Sounds like all (at least most ) of the support is present in the main U-Boot repository ( GitHub being a mirror)? Looks ...
by ehem
Tue Jan 14, 2020 12:38 am
Forum: Advanced users
Topic: Using a Pi as an X-server for another computer.
Replies: 6
Views: 990

Re: Using a Pi as an X-server for another computer.

It should be some simple configuration, to get the Pi to act this way, does anyone know how to go about this? Anyone know how you would start? The "old school" way is to allow remote xclients to access the Pi's xserver via tcp... There are newer (more secure) ways that use other protocols...
by ehem
Mon Jan 13, 2020 11:14 pm
Forum: General discussion
Topic: Can read from, but can't write to USB drive
Replies: 19
Views: 4092

Re: Can read from, but can't write to USB drive

To get more data about a GPT disk you can't use fdisk. You need to use sudo sfdisk -l /dev/sda The program most often present as /sbin/fdisk is not the olde `fdisk` program you're used to. In fact the program most likely in /sbin/fdisk shares much of its core source with `sfdisk`. The modern Linux ...
by ehem
Sun Dec 22, 2019 6:47 pm
Forum: General discussion
Topic: Raspberry Pi 4 usb boot?
Replies: 574
Views: 267496

Re: Raspberry Pi 4 usb boot?

usb-boot works equally well on the Raspberry Pi 1, 2, 3, and 4. I'm pretty sure that has its own built-in assumptions which can be broken. For example if someone is trying to use the UEFI as a second-stage, then chaining to GRUB (there are things which can easily be done with GRUB which I rather do...
by ehem
Sun Dec 22, 2019 6:08 pm
Forum: Debian
Topic: Modules for 4.19 on RP4?
Replies: 1
Views: 1875

Re: Modules for 4.19 on RP4?

I was originally asking this in the hope my project could be workable with a kernel close to a generic Debian kernel plus a few patches. Then I looked at the git history of the relevant kernel source code. The Raspbian kernel closely follows Greg Kroah-Hartman's branch, this is the official 4.19.89 ...

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